TISP4A250H3BJ Datasheet, PDF (1/8 Pages) Bourns Electronic Solutions – Overvoltage Protector

*RoHS ^COMPLIANT
TISP4A250H3BJ
ASYMMETRICAL-BIDIRECTIONAL THYRISTOR
OVERVOLTAGE PROTECTOR
TISP4A250H3BJ Overvoltage Protector
RING Line Protection for:
— LCAS (Line Card Access Switch) such as Le75181,
Le75183 and Le75282
Voltages Optimized for:
— Battery-Backed Ringing Circuits
Maximum Ringing a.c..................................................104 Vrms
Maximum Battery Voltage ................................................. -52 V
Device Name
TISP4A250H3BJ
V_DRM
V
+100
-200
V_(BO)
V
+125
-250
SMB Package (Top View)
(Ground) 1
2 (Ring)
Terminal typical application names
shown in parenthesis
MD-SMB-006-a
Device Symbol
(Ring)
Rated for International Surge Wave Shapes
Wave Shape
Standard
2/10
8/20
10/160
10/700
10/560
10/1000
GR-1089-CORE
IEC 61000-4-5
TIA-968-A
ITU-T K.20/21/45
TIA-968-A
GR-1089-CORE
I_PPSM
A
500
300
250
200
160
100
How To Order
Device
TISP4A250H3BJ
Package
SMB
Carrier
Embossed Tape Reeled
(Ground)
SD-TISP4A-001-a
..........................................UL Recognized Component
Order As
TISP4A250H3BJR-S
Marking Code
4A250H
Standard Quantity
3000
Description
The TISP4A250H3BJ is an asymmetrical bidirectional overvoltage protector. It is designed to limit the peak voltages on the Ring line
terminal of the LCAS (Line Card Access Switch) such as Le75181, Le75183 and Le75282. The TISP4A250H3BJ must be connected
with bar-indexed terminal 1 to the protective Ground, and terminal 2 to the Ring conductor.
The TISP4A250H3BJ voltages are chosen to give adequate LCAS ring line terminal protection for all switch conditions. The most
potentially stressful condition is low level power cross when the LCAS switches are closed. Under this condition, the TISP4A250H3BJ
limits the voltage and corresponding LCAS dissipation until the LCAS thermal trip operates and opens the switches.
Under open-circuit ringing conditions, the line Ring conductor will have high peak voltages. For battery backed ringing, the Ring
conductor will have a larger peak negative voltage than positive, i.e. the peak voltages are asymmetric. The TISP4A250H3BJ has a
similar voltage asymmetry and will allow the maximum possible ringing voltage, while giving the most effective protection. On a connected
line, the Tip conductor will have much smaller voltage levels than the open-circuit Ring conductor values. Here a TISP4xxxH3BJ series
symmetrical voltage protector gives adequate protection.
Overvoltages are initially clipped by breakdown clamping. If sufficient current is available from the overvoltage, the breakdown voltage
will rise to the breakover level, which causes the device to switch into a low-voltage on-state condition. This switching action removes
the high voltage stress from the following circuitry and causes the current resulting from the overvoltage to be safely diverted through the
protector. The high holding (switch off) current prevents d.c. latchup as the diverted current subsides.
*RoHS Directive 2002/95/EC Jan 27 2003 including Annex
NOVEMBER 2006 - REVISED MAY 2007
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.